27 January 2010 Restoring the spatial resolution of refocus images on 4D light field
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This paper presents the method for generating a refocus image with restored spatial resolution on a plenoptic camera, which functions controlling the depth of field after capturing one image unlike a traditional camera. It is generally known that the camera captures 4D light field (angular and spatial information of light) within a limited 2D sensor and results in reducing 2D spatial resolution due to inevitable 2D angular data. That's the reason why a refocus image is composed of a low spatial resolution compared with 2D sensor. However, it has recently been known that angular data contain sub-pixel spatial information such that the spatial resolution of 4D light field can be increased. We exploit the fact for improving the spatial resolution of a refocus image. We have experimentally scrutinized that the spatial information is different according to the depth of objects from a camera. So, from the selection of refocused regions (corresponding depth), we use corresponding pre-estimated sub-pixel spatial information for reconstructing spatial resolution of the regions. Meanwhile other regions maintain out-of-focus. Our experimental results show the effect of this proposed method compared to existing method.
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JaeGuyn Lim, ByungKwan Park, JooYoung Kang, SeongDeok Lee, "Restoring the spatial resolution of refocus images on 4D light field", Proc. SPIE 7533, Computational Imaging VIII, 753310 (27 January 2010); doi: 10.1117/12.838830; https://doi.org/10.1117/12.838830

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